* Add POEditor badge for language translation progress * Add example, tests, and documentation key for POEditor * Remove redundant required() as indicated in PR review * Throw errors instead of rendering red badge * small wording tweak: mention read-only again Co-authored-by: chris48s <chris.shaw480@gmail.com> Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>